db-derby-user mailing list archives

I'd like to chime in and say that we run such SELECT COUNT(*) queries all
the time in Derby and have never encountered a problem.
Don't think that "AS" aliasing is necessary.
From:
Chris Wilson <chris@aptivate.org>
To:
Derby Discussion <derby-user@db.apache.org>
Date:
01/21/2011 01:07 PM
Subject:
Re: Issue with COUNT function
Hi NBW,
On Fri, 21 Jan 2011, NBW wrote:
> SELECT COUNT(*) FROM (SELECT file.md5, instCollection.collectionId FROM
> file, collection leafCollection, collection instCollection WHERE
> (file.status=1 OR file.status=2) and file.collectionId =
> leafCollection.collectionId AND leafCollection.instanceCollectionId =
> instCollection.collectionId GROUP BY file.md5,
instCollection.collectionId)
>
> That query under Oracle works fine. Under Derby I get the following
error:
>
> [42X01][30000] Syntax error: Encountered "<EOF>" at line 1, column 313.
>
> If I run the query without the SELECT COUNT(*) it will run fine in Derby
> too, but I am trying to get the count :-)
>
> I feel like I must be missing something obvious here.
I think that every sub-SELECT must have a table alias in Derby, so add "AS
t" to the end of the query (after the closing parenthesis) and it might
work :)
Cheers, Chris.
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